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SubjectRe: [regression 5.4.97 → 5.10.24]: raid6 avx2x4 speed drops from 18429 MB/s to 6155 MB/s
Den 2021-04-02 kl. 17:05, skrev Borislav Petkov:
> On Fri, Apr 02, 2021 at 10:33:51AM +0200, Paul Menzel wrote:
>> Dear Linux folks,
>>
>>
>> On an two socket AMD EPYC 7601, we noticed a decrease in raid6 avx2x4 speed
>> shown at the beginning of the boot.
>>
>> 5.4.95 5.10.24
>> ----------------------------------------------
>> raid6: avx2x4 gen() 18429 MB/s 6155 MB/s
>> raid6: avx2x4 xor() 6644 MB/s 4274 MB/s
>> raid6: avx2x2 gen() 17894 MB/s 18744 MB/s
>> raid6: avx2x2 xor() 11642 MB/s 11950 MB/s
>> raid6: avx2x1 gen() 13992 MB/s 17112 MB/s
>> raid6: avx2x1 xor() 10855 MB/s 11143 MB/s
>
> Looks like those two might help:
>

That would mean only this is missing:
> 49200d17d27d x86/fpu/64: Don't FNINIT in kernel_fpu_begin()


as this one landed in 5.10.11:
> e45122893a98 x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state
>

--
Thomas

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